A car is traveling at 25 miles per hour along a road parallel to the straightaway of a middle school's track. The starter's gun for the 50 yard dash goes off just as the car passes an imaginary line that is an extension of the starting line. About how many seconds does it take the car to reach a place on the road that corresponds to the finish line?
a.3.7 seconds
b.1.4 seconds
c. 23 seconds
d. 4.1 seconds

it would take 7/10 of an hour too fill the pool.

step-by-step explanation:

i think it is c hope that

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."